[FPM] add fpm support

Makefile.manual

@@ -19,6 +19,11 @@ test:
 	@echo
 	@echo "All tests passed."
 
+# Fortran STDLIB Makefile for FPM BUILD
+dev:
+	$(MAKE) -f Makefile.fpm --directory=src
+
 clean:
 	$(MAKE) -f Makefile.manual clean --directory=src
 	$(MAKE) -f Makefile.manual clean --directory=src/tests
+	$(MAKE) -f Makefile.fpm clean --directory=src

README.md

@@ -3,18 +3,20 @@
 [![Actions Status](https://github.com/fortran-lang/stdlib/workflows/CI/badge.svg)](https://github.com/fortran-lang/stdlib/actions)
 [![Actions Status](https://github.com/fortran-lang/stdlib/workflows/CI_windows/badge.svg)](https://github.com/fortran-lang/stdlib/actions)
 
-* [Goals and Motivation](#goals-and-motivation)
-* [Scope](#scope)
-* [Getting started](#getting-started)
-  - [Get the code](#get-the-code)
-  - [Requirements](#requirements)
-  - [Supported compilers](#supported-compilers)
-  - [Build with CMake](#build-with-cmake)
-  - [Build with make](#build-with-make)
-* [Using stdlib in your project](#using-stdlib-in-your-project)
-* [Documentation](#documentation)
-* [Contributing](#contributing)
-* [Links](#links)
+- [Fortran Standard Library](#fortran-standard-library)
+  - [Goals and Motivation](#goals-and-motivation)
+  - [Scope](#scope)
+  - [Getting started](#getting-started)
+    - [Get the code](#get-the-code)
+    - [Requirements](#requirements)
+    - [Supported Compilers](#supported-compilers)
+    - [Build with CMake](#build-with-cmake)
+    - [Build with make](#build-with-make)
+    - [Build with fpm](#build-with-fpm)
+  - [Using stdlib in your project](#using-stdlib-in-your-project)
+  - [Documentation](#documentation)
+  - [Contributing](#contributing)
+  - [Links](#links)
 
 ## Goals and Motivation
 
@@ -175,6 +177,18 @@ You can limit the maximum rank by setting ``-DMAXRANK=<num>`` in the ``FYPPFLAGS
 make -f Makefile.manual FYPPFLAGS=-DMAXRANK=4
 ```
 
+### Build with [fpm](https://github.com/fortran-lang/fpm)
+You can build using provided `fpm.toml`:
+```bash
+make dev -f Makefile.manual
+---
+fpm build
+```
+To use `stdlib` within your fpm project, add the following to `fpm.toml` file:
+```toml
+[dependencies]
+stdlib = { git = "https://github.com/fortran-lang/stdlib.git" }
+```
 
 
 ## Using stdlib in your project

fpm.toml

@@ -0,0 +1,18 @@
+name = "stdlib"
+version = "0.0.1"
+license = "MIT"
+author = "stdlib contributors"
+maintainer = "https://github.com/fortran-lang/stdlib"
+copyright = "2019-2021 stdlib contributors"
+description = "Fortran Standard Library"
+categories = ["numerical"]
+keywords = ["numerical", "stdlib"]
+
+# cd stdlib && make dev -f Makefile.manual && fpm build
+[library]
+source-dir="src/fpm"
+
+[build]
+auto-executables = false
+auto-examples = false
+auto-tests = false

src/Makefile.fpm

@@ -0,0 +1,29 @@
+
+SRCFYPP := $(wildcard *.fypp)						# Get all fypp files
+SRCFYPP := $(filter-out common.fypp, $(SRCFYPP))	# Filter some individual files
+
+SRCF90 := $(wildcard *.f90 *.F90)							# Get all f90  files
+SRCF90 := $(filter-out f08estop.f90, $(SRCF90))		# Filter some individual files
+
+# FPMSRCDIR: Output source files path 
+FPMSRCDIR = fpm/
+VPATH = $(FPMSRCDIR)
+
+SRCGEN := $(SRCFYPP:.fypp=.f90)
+
+.PHONY: all clean
+
+all: $(SRCGEN) CPF90
+
+clean:
+	cd $(FPMSRCDIR); $(RM) $(SRCGEN) $(SRCF90)
+
+# GEN F90 files to `fpm/` from FYPP files
+$(SRCGEN): %.f90: %.fypp common.fypp
+	@mkdir -p fpm
+	fypp $(FYPPFLAGS) $< $(FPMSRCDIR)$@
+
+# COPY F90 files to `fpm/`
+CPF90: $(SRCF90)
+	@mkdir -p fpm
+	cp -u $^ $(FPMSRCDIR)

src/common.fypp

@@ -52,7 +52,7 @@
 
 #! Ranks to be generated when templates are created
 #:if not defined('MAXRANK')
-  #:if VERSION90
+  #:if defined('VERSION90')
     #:set MAXRANK = 7
   #:else
     #:set MAXRANK = 15

src/fpm/f18estop.f90

@@ -0,0 +1,29 @@
+submodule (stdlib_error) estop
+
+implicit none
+
+contains
+
+module procedure error_stop
+! Aborts the program with nonzero exit code
+!
+! The "stop <character>" statement generally has return code 0.
+! To allow non-zero return code termination with character message,
+! error_stop() uses the statement "error stop", which by default
+! has exit code 1 and prints the message to stderr.
+! An optional integer return code "code" may be specified.
+!
+! Example
+! -------
+!
+! call error_stop("Invalid argument")
+
+if(present(code)) then
+  write(stderr,*) msg
+  error stop code
+else
+  error stop msg
+endif
+end procedure
+
+end submodule estop